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(WARNING)
RED MESSAGE (CAUTION)
AMBER MESSAGE (ADVISORY)
CYAN MESSAGE (STATUS)
WHITE MESSAGE Require immediate crew attention. These messages are accompanied by flashing master warning, triple chime attenson with or without voice message or dedicated tone. Require immediate crew awareness and future crew action may be required in the form of alternate system selection or performance limitation. These message are accompanied by flashing master caution and a single chime. Indicate safe or normal system operation which require crew awareness, over and above the dark cockpit philosophy. Indicate minor failures or reduction in systems capability, which require no crew action.

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02/03/21

Message Overview:

Message Name:

NO L-IRS-1 BUS INPUT

Message Code:

B3-006723

Associated CAS:

None

Reporting LRU: FGC 1
System Description: 22-11-00
Schematic Diagram: 22-11-00 (20501 - 20999)
Wiring Diagram: 31-45-01(20501 - 20999)

Message Description:

FGC1 is reporting L-IRS-1 input inactive while IRS1 is present at IOC1.

Possible Causes:

  • Left Flight Guidance Computer 1 (FGC) (A4-FGC)
  • Integrated-Avionics Processor System (IAPS) Card Cage (ICC) (A4)

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of Flight Guidance Computer (FGC) AMM 22-11-01-000-801
Installation of Flight Guidance Computer (FGC) AMM 22-11-01-400-801
Removal of Integrated-Avionics Processor System (IAPS) Card Cage (ICC) AMM 31-45-01-000-801
Installation of Integrated-Avionics Processor System (IAPS) Card Cage (ICC) AMM 31-45-01-400-801

Troubleshooting Recommendations:

  1. Reset L IAPS Circuit Breaker CB1-B6. Is the fault message still present?

    1. If YES, continue with next step.
    2. If NO, do close out.
      NOTE: Before you open the IAPS circuit breakers, make sure that all Engine FADEC circuit breakers are open. If the Engine FADEC circuit breakers remain closed, Engine Igniters will activate. This can cause injury to persons and damage to equipment.

  2. Swap Left FGC with right FGC. Is the fault message still present?

    1. If YES, continue with next step.
    2. If NO, replace defective FGC.

  3. Replace IAPS card cage (A4).
  4. Do close out.

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